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Need help changing the width of a Vertex shader

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Hi im trying to change the width of a Vertex shader it deals with the intel rings the thickness is to much i would like to half the size of them, any help would be great thanks
code is bellow or full hlsl here http://www.box.net/shared/uqlt3qg5yg

// Vertex shader

#ifndef XBOX
int index : INDEX
#ifdef XBOX
RangeVS_INPUT In = CreateRangeVertexInput( index );

// Output from vertex shader
RangeVS_OUTPUT Out = (RangeVS_OUTPUT)0;

// Scale the vertex based on requested range, and add in the instanced position
In.Vertex.xy *= dot( In.AlphaScalar.yz, float2( In.Radius.y, In.Radius.y + FogIntel.z ) );
In.Vertex.xy *= dot( In.AlphaScalar.yz, float2( max( 0.0f, In.Radius.y - FogIntel.z ), In.Radius.y ) );
In.Vertex.xy += In.Position.xy - 1;

// Scale the values by the map dimensions and then map to [-1,1]
In.Vertex.xy *= FogIntel.xy;
In.Vertex.xy = In.Vertex.xy * 2 - 1;

// Transform vertex to homogenous clip space
Out.Position = float4( In.Vertex.x, -In.Vertex.y, 1.0f, 1.0f );
Out.Color = In.AlphaScalar.xxxx;
Out.Color = float4( 1.0f, 1.0f, 1.0f, 1.0f ) - In.AlphaScalar.xxxx;

// Return our finished product
return Out;

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